#!/usr/bin/env bash
# CWE-407 scan — Varnish Cache (VCL compiler, backend graph)
set -euo pipefail
echo "# scan=varnish host=$(hostname) date=$(date -u +%Y-%m-%dT%H:%M:%SZ)"
cd /tmp && git clone --depth 1 https://github.com/varnishcache/varnish-cache varnish 2>&1 | tail -1

GRAPH_KW="topolog|cycle|reachab|dfs\b|scc\b|dominator|postorder|dependency|vcl.*graph|graph.*vcl"
C_MEM='VTAILQ_FOREACH.*==\|VSB_.*find\|for.*next.*next\b\|linear.*search\|vcc_.*find'

for dir in lib/libvcc bin/varnishd; do
  [ -d /tmp/varnish/$dir ] || continue
  echo "# roots: /tmp/varnish/$dir"
  find /tmp/varnish/$dir -name "*.c" -o -name "*.h" | sort | while IFS= read -r f; do
    gl=$(grep -inE "$GRAPH_KW" "$f" 2>/dev/null | cut -d: -f1 | head -5 || true)
    [ -z "$gl" ] && continue
    while IFS= read -r ln; do
      s=$(( ln > 20 ? ln - 20 : 1 )); e=$(( ln + 20 ))
      hit=$(sed -n "${s},${e}p" "$f" 2>/dev/null | grep -iE "$C_MEM" | head -1 | sed 's/^\s*//' || true)
      [ -n "$hit" ] && echo "CANDIDATE	${f}:${ln}	${hit}"
    done <<< "$gl"
  done
done
echo "# scan complete"